This repository contains OpenSCAD models of various interior control knobs for a 2004 Chevrolet Astro. For obvious reasons the selection is biased towards those that tend to break at around ($PRESENT_YEAR - 2004) years. It seems likely that at least some of these will fit other GM vehicles of the late '90s and early '00s, probably biased towards the earlier end of that range (the Astro interior was an old design by 2004). See comments in the individual source files for details on what they are.